[issue31040] mimetypes.add_type should complain when you give it an undotted ext

[Julien Palard]

Julien Palard <julien+python at palard.fr> added the comment:

I think we should deprecate calling `add_type` with an empty `ext`, as I don't think it's a feature, more a side effect of the current implementation.

But as some may use it like a feature, I asked the current PR to emit a warning, to not break the current implementations.

To be able to simplify in the future, why not deprecating empty `ext` so we can remove it in a few versions?

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nosy: +mdk

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